Sound recording machine



J y 19,1932, J. H. SAILUARD 1,868 369 SOUND RECORDING MACHINE Filed Jan.19, 1929 MVE/VTOR .11?! 84/1 LIA no Y QAZZW Patented July 19, 1932UNITED STATES PATENT OFFICE JOHN H. SAILLIARD, OF GREAT KILLS, NEW YORK,ASSIGNOR TO BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N.Y., A CORPORATION OF NEW YORK SOUND RECORDING MACHINE Application filedJanuary 19, 1929. Serial No. 333,731.

This invention relates to sound recording machines and its object is tofacilitate the pro duction of records with such machines.

The advantage of being able to reproduce a record immediately afterrecording is well understood in the art. Such a procedure represents theonly sure way of determining without great loss of time whether therecord being made-is satisfactory. Accordingly, va-

rious devices for reproducing the original soft wax recordshave beenproposed. One of these. is disclosed in Patent 1,778,386 to H. C.

Harrison, October 14, 1930 and consists of a desiredto play back arecord, or moreoften,

a small portion of a record, which had just been made, it was necessaryto remove the recorder from its sup orting saddle and substitute for ita play-hack reproducer. This procedure was found to be objectionable forseveral reasons. The frequent interchanging of the. translating deviceswas not only inconvenient but it also involved the loss of the recorderadjustment which had been obtained I by careful experiment It was foundalso 0 that very. careful adjustment of the' reproducer in its holderwas necessary to insure that it was not biased toward one side or theother since any appreciable bias introduced distortion in thereproduction and might damage the record grooves.

In orderto avoid distortion in the record the recorder adjustmentreferred to above must be such that when the recorder is in cu tingposition on the record the cutting face of the stylus is exactlyvertical This means that the supporting arm of the recorder must i beaccurately located in vertical adjustment in accordance with thethickness'of the record material and the dimensions of the particularrecorder used. When once adjusted the recorder can of course be raisedfrom the surface of the record and lowered again without losing theadjustment by rotating the recorder about .its own horizontal axis. Butwhen the recorder is removed from its saddle and the reproducer isinserted for play-back purposes. the vertical adjustment must be changeddue to the difference in the dimensions of the two devices and hence therecorder must be readjusted when replaced before the recording cancontinue.

In accordance with the general features of this invention theseobjections are overcome by attaching to the arm carrying the recorderholder an additional clamping device for the. play-back. This device ismade both rotatably and vertically adjustable with respect to thesupporting arm so that the play-back may be used for reproducing allorany portion of a record without disturbing the recorder adjustment.Suflicient freedom in the movement of the reproducr is obtained byproviding ball bearing pivots between the reproducer saddle and itssupporting member and leveling the reproducer in its saddle by means ofthe rotary adjustment.

v This invention will be more readily understood from the followingdetailed description considered in, connection with theaccompanying'drawing, in which Fig. 1 is a general vlew of oneembodiment showing also certain parts of a disc recording machine;

Fig. 2 is a more detailed view of the playback reproducer clampingdevice and shows the adjustment between this device and the recordersupporting members; and

Fig. 3 is'an end view of the clamping device of Fig. 2. v

Since the present invention concerns the adjustment of the recording andreproducing devices, only those parts of the recording machine necessaryto an understanding of the invention have been shown. Such a machineconsists essentially of a turntable for carrying the record discs,driving means for the turntable such as a motor 2 and a carriage 3 forthe recording and reproducing devices. The position of these deviceswith respect to the record 4 may be varied by moving the carriagemanually by means of a Patent 1,711,650 to-H. Pfannenstiehl, May 7,1929. v

- Referring now to thoseparts of the carriage whichrelate particularlyto this invention and are shown in Fig. 2, the recorder supporting arm 8I is attached to the main supporting arm 9 by means of a set screw 10passmg through a hole in the face-plate .1- 1.

. The reproducer arm 12 is in turn secured to v the set screw 18 whichmoves the saddle holder 16 about'the rod 17 against the tension of thespring 19. The saddle 20 is pivotally mounted in its holder by means ofan axle rod 21 resting in ball bearings 22-22 and an adjustablecounterweight 23 is provided to balance part of the weight of thereproducer and-permit variation of the pressure which the needle 24exerts on the record 4. The saddle-lifting lever 25 is piv'otallymounted on a saddle holder 16 by a machine screw 30 and has an eccentriccam surface 31; which engages a pin 26 in the member 32 projectingupwardly from the saddle 20. In the position shown in Figs. 2 and 3 thelever 25 is in the operating position, that'is to say, the reproducerarm 27 is horizontal and the stylus 24 is in contact with the recordgroove. As the lever is turned in a clockwisedirection about its pivot 30 the' cam surface 31 moves the pin 26 upwardly, thereby raisingjustmentiof the recorder 28 inasmuch as the level of the arm 9 has-notbeen changed.

While this invention has been described with reference to a particularembodiment it is intended to limit it'only by the scope of the followingclaims. I 7 What is claimed, is: 1. In a machine for cnttin andreproducing soundrecords, the com ination with a turntableanda carriagecarrying a recording device, of means for reproducing without disturbingthe recorder adjustment, a record cut by the recorder compr1sing areproducer and a mounting therefor, the reproducer being pivotallyconnectedto the mounting and'the mounting being both rotatably andvertically adjustable with respect to the car 'the arm, a saddle holder.supported by the a reproducer arm on a horizontal axisat right angles to5 the saddle axis, means for moving the saddle holder about its axis andmeans for raising the arm independently of the recorder.

.In witness whereof, I hereunto subscribe 18th,d'ay of January, 1929.

my name this JOHN H. SAILLIARD.

the stylus oil the record by rotating the saddle20 in acounter-clockwise direction about its 'be'arings22. In this way-thelever25 permits the stylus to be raised and lowered as required after thevertical adjustment has been locked by the set screw 15. When it isdesired to play back suitable t pe such as that disclosed in Patent1,778,386 to H. C. Harrison, October 14, 1930, is fitted to a suitablereproducer arm 27, which in turn is placed in'the saddle 20. Thereproducer and its supporting mechanism at this time has been raisedsufliciently to clear the record surface by means of the screw'14. Theset screw 18 is adjusted so that the reproducer 'armrides freely in itssaddle without a tendency to bind on either side and the screw .14 isreset with the needle 24 resting on the record 4 and perpendicular toit. The set screw 15 is then tightened tomaintain this adjustment andthe needle is then lifted from the record v onlyby the lifting lever 25.

.It is evident then that the stylus 24 may be I brought into contactwith any desired portion ofthe record by means. of the crank 5 and thatthis procedure does not interfere with the ad from the vrecord thereproducer which may be of any

